The cost of electricity varies by state. Some states are more expensive than others are to run electricity. Taking into an average cost of electricity, it costs about 22 cents to run a 60 watt light bulb for 24 hours. A florescent light bulb costs five cents a day, while a high-intensity light bulb costs 10 cents a day. These costs are based on 17.2 cents per kilowatt-hour electric rate, which is an average for the United States.